If I'm just laying in the grass or snow or dirt at a cemetery without lights then no. If I can sleep in a car and the cemetery has lights then yeah. I wouldn't want to be laying outside in the dark at a cemetery.

if that were true you wouldn't have suggested using a tarp and heavy quilt

not with that stuff plus its not that cold just wait till february in canada since your from the UK it gets -40 to -50 of course I am from Minnesota so I am not to close from ya. -20 to -30 is nothing for me but if I am gonna sleep I am going to need that Tarp and bag.